Ejector for taper-shank cutting tools



Jan- 6, 1931- .1. E. ANDERsoN 1,788,268 u I EJECTO?! FOR TAPER SHANK CUTTING `TOOLS Filed Jan. 28, 1928 Patented Jan. v6,k v

OFFICE f JOHN' ELMEB ANDERSON, or 'NEW HAivLrsHIaEg essIerNoN To KINGSBURY; MA-

'cHINE'rooL coNPoR-A'rIoN, OFKEENE,v NEW HAMPSHIRE, n coJaroRA'rIQN or N Ew QEJEYGTOR Fon TAPERsHANx CUTTING' rroots yApplication, 1ed January, 2811928. Serial No. 250,253. i

This invention relates tojafnoejector for use on a'chuck for taper shank cutting tools.

f @ne of,` the .objects of this invention 'is the provision of a-camejectorin which the cam may be held in the position for the insertion cfa taper shank cutting tool.r j i Another object of'this invention is toy :pro-v vide agstructurewhereby such holdingmeans is likewise employedtoprevent a movement of the" cam supporting block into and outoi` j position in the AaX-ia'l direction lof rthe cam.r

' A A furtherobject offtheinvention :is to provide a cam ejector which acts directly on the' end of thetaper shank cutting` tool inserted in the chuck,so that by a rocking or oscilla` tion of the cam, lalternate kstresses mayk be applied ongthetaper shank to cause la slight rocking/movement whereby to loosen it in the chuck4 s1eeve,.in"addition to imparting an axial movement ,to the taper shank lwith lrespect tothe sleeve.

A further. feature of this invention is the construction andi arrangement of the parts so that the cam supporting member-.1s pre- Ventedifrom Wlthdrawal from' th'echuck' by polygonal cavity 27 f toreceivethe end offav a taper shank cutting tool whenr in the 'chuck sleeveI` n j Ony Vthe'` accompanying drawings `is illus.-

trated oneform of employmentof the invention byway of example, in which:

Figure 1- isan-'elevationof a chuck having a-cam' ejector according tothe present 1nvent-ion. y j

Fig. 2 is a sectional view-substantially on v liney 2-,2` of Fig. 1,.,with parts eliminated y holds the threaded endf12 of. thefdrill spindle whichf has. a tool receiving sleeve 13-at itswother endinwhich a cutting tool 14 havingataperedshank 15 may be received.:YK .The taper' shank 15 ofy thegtool terminates 1n ka r-lattenedl having a rounded. end surface, as shown in Fig. 3.a

' A bore -holel17 passes through the chuck i bodyfopposite the end of the tang 16f so' that the/:tang projects Wellinto. the.. bore` hole 17 and is adaptedlto rotate freely there- `to leave ,aneccentric connecting bridge 2l) having afcurved or double cam surface: 2l

22A at the other side-i 'The taperedvhole in the; Y tinued beyondL the borehole 17Vl as. a .cylindrif opposite:thetangk 16, and a flattened surfacey sleeve 13'v isy con cal hole 23. which receives a. coil lspring 24 i I carried partly inthe cupped plunger 25fhaving a beveled' end` 26` with ,its-angle. adapted' to iitlt tothe conical walls 19l of thel ej ector body 18, while its flat end may rest upon the flattened part 22 of the bridge. 20.

At one end of the ejector'body `18islformed halves offthis `mark being in alinernent` when the bridge 20 farthest removed fromrthev tang. 16. u y l e Thermethod of operation ofthis ejector is as follows: When a cutting tool. 14 is seated itsztaper shank in the sleeve 13, its` tang 16 projectsinto the-cut away portion ofthe ejectorbody 18. y Theejectorbody 18 is held in the position of-Fig! bythe engagement ofthe plunger cup 25. by its lflat end on the flat part 22 of the bridge 20. When itisde'- siredrto"removethe-cutting tool 14 from the chuck 13, a key is inserted in the cavity 27 ofthey ejector body,y andjthis ejector body is rotated ,about its axis, wherebythe surface 22 movesaway from beneath: the. cupped plunger 25 in rotation until its surface. 22

comesfagainst theiupper end of the-tangjl,

' t-huscausing a. stress upon the ntaper shank 15 i Y Y j shank isY worked loose. "Itwill benotedthat,

inthe axialzvdirection, and also forcing the Vtang and taper shank toward one wall of the taper hole in the chuck sleeve 13, tending to' release it if stuck.- lf this first turning 1 nioveinent ofthe ejector body 18 does not 'accomplishv the removal ci the tool 14,'the

key is turned in the opposite KVdirection so that the body 18 rotates until'another part oifthe doublezcain surface 9.1L strikes against the other side-.ofth'egend oft tlietanglG, and z' again an axial stress isplaced upon the taper shank,.but with a working-mot the tang itself toward the diainetrally opposite wall of the taper lhole in the chuck sleeve 13. This operation can be continued 7until the taper the cam surface 21 does not produce a simple .axial inlovenient or strain onthe taper shank lng inovenient. i Y Y.

'lVhen the ejector body 18 is at any other position thanV that shown in 3,- itis still held yagainst raxial inov'ernentlout of the e j* ofY the tool, but a'coinbinedf axial'V and VVrecks Y L Y chuck body by'the'engagenient of the cupped plunger' 25 against yits conical surfaces 19:

Vbut iffit be desired to reineveit',` a" direct pressure upon either end 'will `torce thepcupy plunger away from` and outv of`tlie"'grooveV suii'iciently so that the ejectorv body 18 inay be disengaged.v It willbe noted, however, that as long as aV tool is' seated within the 'chuck sleeve 13'the tangl projects into the cutv away iportion'of the ejector body 18 and prevents "it's'reinova'l: so that the parts re'-y kinainv in operative condition so long as "their operation may be required. :Furtheig' if the tool tendsl to 'rotateA withinftheichuck, the

side's'of the iiattened tang immediately, come Y in Contact Vwith the Walls r of the cutaway portion so that a` driveis established through the ejector body to the tank ofthe tool.

` It is obvious thatv the invention is not liinited to the Yform of execution shown', but `may of the* appended claiins lhat I claim is: y f

' AI. Ina chuck for' taper shank 'cutting tools,

a body having'an'axial'cavity'to receive the taper shankoil a cutting tool anda bore hole intersecting this innerend of said cavity, an

be embodied -iniinmyrways vvithinthe scope `ejectorlbody of circular section substantially iilling andV rotatable' aboutits axisin said 'bore hole 'andbeingcut away substantially centrally of its length opposite the said axial cavity to form a cain surfa'ceeccentri'c tosaid 'axis y.vitliinthe ejector body,'the cavity and bore hole being so located and arranged that intersecting the inner end of said cavity, an

ejector body rotatable in 'said bore hole Vand having. anaiinular groove therein with coni- `cal walls, 'a retaining plunger having a beveled end guided insaid chuck body and adapted to tenter vsaid groove toretain the ejector body' in said chuck body during the relativeio'tation of the; ejector body; and a A 1 Spring acting upon saClietainng plunger t0 .lioldthe sameinposition. A Y, y .A A

3. fin achuck for taper shankcuttingtoolsv a chuck 4body having; an axial cavity to receive the taper shank of a cutting tool anda A bore liole intersecting Ithe inner end of said cavity, an ejector body rotatable in said bore helel andhaving-'a cai'nto'cooperate with the end fof theY shank 'toejec't the tecl4 froiirtheVv cavity, said 'ejector bodyfalso having a flat# tened portion, a retaining plungerpguidedin said chuckbody and 4adapted to engage said flattened portion* to' hold4A said ejector bodyv against'rctation when in inoperative position,

a spring Vto forcesaidplunger. against s'faid `ejector body,- and nieans to-rock said 'ejector body. l

In achuck taper'shaiik cuttingtools,"`

jchuckb'ody #having an axialcavity to receive the taper shank of a cutting tool anda bore hele intersecting theI inner' ei'id'of said cavity, an ejector body'rotatable" insaid bore holeand cut away to provide'a doubleV sur-l face cani within said ejector body, thegeiid of the shank 'of the cuttingtool enteringV the ejector body at thexcut away portion'l thereof, whereby the'ejector body may' be rocked f eo in both directions to exert an outward an alternate lateral'thrustfon said shank to free and eject the tool from the cavity, and means tosrocksaid ejecter body; Y

- In a chuck-for taper shank cutting tools,

a vbody having an axial cavity to receive Ya taper shank of a cutting tool and a bore hole'Y intersecting the innerend 'of the cavity, a substantially cylindrical ejector bo'dyv rotatable in said bore hole and being cutaway chordalbody, and nieansfonthebody to exert lateral and axial stresses on the tool to free and eject the tooll from the cavity.v j

` 6. In a chuck for vtaper shank cuttingtools,

'a' body having an axial vcavity to receive the taper shank of a cutting tool and a -borehole intersecting the inner end-ofsaid cavity, an ejector body of circular section substantially iilling and rotatable in said bore hole and haviiiglan annular groove thereon opposite said axial cavity, said cavity being extended beyond'said ejector body, a` cup-like retaining plunger guided in said extended vcavity ly sov that thetang ofthe t'ool may enter the and adapted to ent-ersaid groove-to retain the f ejector bodyiin said chuck body during the relative rotation of said ejector body, anda spring insaidextended cavity and in said cup-like plunger yand acting upon the Vinternal walls of the same to hold the plunger invsaid groove. l v

7. A chuck-as in claim 6, in which the bot,- tom of the annular groove has a depression,

andthe plunger is seated in vsgmiddepression n when the ejector bodyl is in position forthe l reception of a tool, said depression and plunger cooperating under the action of said spring to hold theejectol` body in such position for reception. 1

In testimony whereof; I ix Iny signature.

JOHN ELMER ANDERSON. 

